Shaking screen



July 8 1924. 1,500,415

F, c. MORROW SHAKING SCREEN Filed Sept. 10 1923 4 Sheets-Sheet 1 July 81924. 1500,415

F. c. MORROW SHAKING SCREEN Filed Sent; 10. 1923 4 Sheets-Sheet 3 a Q EQx I Q I Q Q i l I a Q m N v L Q 3 N 2 m, Q w

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F. C. MORROW SHAKING SCREEN Filed Sept. '10. 1923' 4 Sheets-Sheet 3 f Rr 4 raj/01 1 040 July 8 1924.

F. c. MORROW SHAKING SCREEN Filed Sept. 10. 1923 4 Sheets-Sheet 4Patented July 8, 1924.

UNITED 1* STATES remix 0. mormow,

PATENT OFFICE.

OF WELLS'ION, OHIO.

srmxmo scnnnn.

Application filed September as to require shipment in a knock-downcondition, the services of skilled mechanics being necessary at thepoint of delivery for the purpose of reassembling the parts. Thesestructures have also required specially constructed tipples which hasadded materially to the cost of installation.

One of the objects of the present invention is to provide a shakingscreen and operating mechanism therefor all of which is combined in acomplete unit that can be shipped as such from the factory to the placewhere it is to'be used, it being possible to set up this unit upon atipple of any construction already in use, thereby materially reducingthe cost of installation.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it n being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed with-' out departing from the spirit of theinvention. V

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings- Figure 1 is a perspective view of the shaking screenvdrive unit, all of the parts being assembled prior to delivery to thepurchaser.

Fig. 2 is a vertical longitudinal section taken on the line 22, Fig. 3.

Fig. 3 is a section on line 33, Fig. 2.

Fig. 4 is a side elevation of one of the levers.

Fig. 5 is a front elevation of said lever.

Fig. 6 is a side elevation on a reduced 10, 1923. Serial No. 861,917.

scale showing the screens assembled with the hopper and feed plate andwith'thc drlvmg mechanism as a single unit. I i Referring to the figuresby characters of reference 1 designates the base frame of the unitformed preferably of channelled beams suitably connected as b means ofcorner plates 2. -The corner plates at one end of the base can be usedto support bearings3 in which is journaled a shaft 4 having pulleys 5and 6. The corner plates at,the other end of the base can be used forsupporting bearings 7 in which is journaled a shaft 8 having sprockets 9and 10.

' A transverse shaft 11 is journaled in bear- I ings 12 on the sides ofthe base and has a pulley 13 adapted to receive motion through a belt'14 from pulley 6. A. sprocket 15 is secured to shaft 11 and drives achain 16 engaging sprocket 9. Crankarms 17 are provided at the ends ofthe shaft 11 and each crank arm is connected by a link 18 to the upperend of a lever 19- secured'to oneend of arock shaft 20. As shown particnlarly in Fig. 5 each lever 19v has its end portions forked so that thelinks 18 project into the upper ends of the levers. Pivotally mountedwithin the upper forked portion of each lever 19 is one end of a pitman21 and another pitman 22 extends into and is pivotally connected to thelower portion of each lever 19. The points at which the pitmans 21 and22 are connected to each lever have been indicated at 23 and 24respectively in Fig. 4. The fulcrum of the lever is the shaft 20 whichextends through an open ing 21 in the lever and midwaiyllbetween thepivotal points-23 and 24:. e operating link 18 of each lever is attachedto the lever 3.1; the upper end thereof as indicated at Secured to androtating with the shaft 11 is a gear 26 constantly meshing withanothergear 27 secured to a transverse shaft 28 rovided with eccentrics'29. Mounted on t ese eccentrics are rings 30 rovided at the lower endsof connecting r0 s 31.

Mounted on the base frame 1 at the sides thereof are standards 32supporting a hopper 33 from which extends an outlet spout 34. A feedchute 35 is inclined downwardly to the hopper and mounted forreciprocation within the lower portion of the ho per is an inclined feedplate 36 constitut ng the bottom of the hopper. This plate is preferablyeupported by rollers or wheels 37 mounted on a track 38 and suitableguides 39 may be provided for the feed plate above and below it as shownin Fig. 2.

J ournaled between the standards 32 and under the hopper 33 is atransverse rock shaft 40 carrying bell cranks 41. The upstanding arms ofthese bell cranks are connected by links 42 to the feed plate 36 and thelower arms of the bell cranks are pivotally engaged by the connectingrods 31. As shown in the drawings each bell crank may be formed with aseries of openings 43 so that the connecting rods can be adjustablyattached to the bell cranks.

The-structure herein described is adapted to be assembled at the factoryand shipped as a complete unit to the point Where it is to be set up. Itcan be set up bodily upon any type of tipple and obviously the cost ofinstallation will be greatly reduced because it does not require theservices of skilled mechanics for assembling the parts at the point ofinstallation.

The pitmans 22 are adapted to be coupled to shaking screens and, byreason of the particular mounting of the pitmans relative to the levers19 the respective screens to which the pitmans are connected willoperate in opposite directions, the movement of each screencorresponding with the movement of the other screen so that theapparatus is in proper balance and can be more easily operated thanwould otherwise be possible. Importance is attached to the use of onelever for engagement by the two pitmans 21 and 22 as well as the link 18because strains due to torque are reduced to the minimum and theapparatus thus rendered more lasting. Importance is also attached to theparticular means for driving the feed plate 36, this means being simpleand positive and allowing for easy adjustment for the urpose of varyingthe movement of the feed plate.

Heretofore it has been the practice when installing shaking screens, tohang the screens to the coal tipple frame so that they constitute oneunit and the driving mechanism has been assembled in the tippleindependently thereof. The present improvements as heretofore describedprovide a base frame 1 for taking up all the vibrations resulting fromthe operation of the drive mechanism.

If desired, however, and as shown in Fig.

6, the frame 1 can be extended so as to support standards 44 carrying aframe 45 from which the screens 46 are suspended by swinging hangers 47.Thus it will be seen that the vibrations set up both by the drivingmechanism and by the screens will be received by the base frame and thetipple structure on which this frame is mounted will thus be relieved ofmuch'of the vibration to which it would otherwise be subjected. Wherethe screen structure is to be mounted on a base constituting anextension of the base 1, as shown in Fig. 6, it would be necessarygenerally to ship the screens separately from the base frame 1 and theparts thereon. It is possible readily to assemble them, however, as willbe apparent.

What is claimed is 1. A shaking screen unit for bodily attachment to atipple orthe like, including a rigid base frame for receiving vibrationand distributing it through the area of the base engaging portion of thesupportin structure, a feed hopper fixedly connecte to and mounted abovethe base, an upper frame fixedly connected to the base, a feed platemounted for reciprocation within the hopper, separate screens supportedby the upper frame and by said frame and base respectively foroscillation, levers supported by the base frame and mounted forsimultaneous oscillation, pitmans connected to each lever at equaldistances from and at opposite sides of the fulcrum thereof, andconnected to the respective screens, means for oscillating the levers tosimultaneously swing the screens in opposite directions respectively butuniformly, a shaft journaled on the base frame, crank arms thereon, linkconnections between the crank arms and the respective levers, and powermechanism supported solely by the base frame for operating the shaft.

2. A shaking screen attachment for a supporting structure or tipple,said attachment being in the form of a complete unit having a rigid basefor resting on the supportin structure, a feedin mechanism supports byand above the ase, suspended screens supported by the base and mountedfor oscillation, power mechanism supported by the base, and means fortransmitting motion from the power mechanism to simultaneously swing thescreens uniformly in opposite directions respectively, said screensbeing balanced against each other, and means operated by said mechanismfor operating the feeding mechanism, said base constituting means forreceiving all vibration produced by the actuation of the mechanisms andscreens.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signature in the presence of two witnesses.

FRANK C. MORROW'. lVitnesses:

M. E. MARTIN, S. S. 8mm.

